I have just the gf and two dogs (one medium, one small) and let me be the first to say.......a TC ain't for you.
Get yourself a 25-30' 5er and be happy! I love my TC for what it is, but if I could have bought a decent-sized travel trailer or 5er for what my TC cost, I would love to have it. If I could only have one, I'd have the TC, because it is more fun for the adventure sort of camping that only a TC can do. But a good size trailer is so comfortable, that other than the adventure sort of camping, it just can't be beat for comfort.
40' is a bit much, though.
